Subjects will complete cognitive tests that measure variables known to be associated with COPD and with positive responses to exercise interventions. This will include measures of global cognitive functioning (MoCA), executive functions (TMT B and verbal fluency), attention and vigilance (CPT), working memory (WAIS-III), episodic verbal memory (RAVLT) and visuospatial abilities (ROCF). Alternative versions will be used to avoid test-retest effect. Dr. Gagnon will be in charge of administering these tests and will ensure that patients who score in the clinical range are properly referred and followed.